Quantum optical link sets new time records

This research from the Neils Bohr Institute could provide the basis for secure quantum theory based communications. By maintaining two atomic systems in a state of entanglement for up to an hour, it opens the door to practical applications leading to highly secure communications.

ScienceDaily (Aug. 19, 2011) — Quantum communication could be an option for the absolutely secure transfer of data. The key component in quantum communication over long distances is the special phenomenon called entanglement between two atomic systems. Entanglement between two atomic systems is very fragile and up until now researchers have only been able to maintain the entanglement for a fraction of a second. But in new experiments at the Niels Bohr Institute researchers have succeeded in setting new records and maintaining the entanglement for up to an hour.